<template>
  <div class="shopcart">
    <div class="shopcart-List">
      <div class="content" @click="toggleList">
        <div class="content-left">
          <div class="logo-wrapper">
            <div class="logo" :class="{highlight:totalCount>0}">
              <i class="icon-shopping_cart" :class="{highlight:totalCount>0}"></i>
            </div>
            <div class="num" v-show="totalCount>0">{{totalCount}}</div>
          </div>
          <div class="price" :class="{highlight:totalPrice>0}">￥{{totalPrice}}</div>
          <div class="desc">另需配送费￥{{deliverPrice}}元</div>
        </div>
        <div class="content-right" @click.stop.prevent="pay">
          <div class="pay" :class="payClass">{{payDesc}}</div>
        </div>
      </div>
      <div class="ball-container">
        <transition v-for="ball in balls"
                    v-on:before-enter="beforeEnter"
                    v-on:enter="enter"
                    v-on:after-enter="afterEnter">
          <div v-show="ball.show" class="ball">
            <div class="inner inner-hook"></div>
          </div>
        </transition>
      </div>
      <transition name="fold">
        <div class="shopcart-list" v-show="listShow">
          <div class="list-header">
            <h1 class="title">购物车</h1>
            <span class="empty" @click="empty">清空</span>
          </div>
          <div class="list-content" ref="listContent">
            <ul>
              <li class="food" v-for="food in selectFoods">
                <span class="name">{{food.name}}</span>
                <div class="price">
                  <span>￥{{food.price * food.count}}</span>
                </div>
                <div class="cartcontrol-wapper">
                  <cartcontrol :food="food"></cartcontrol>
                </div>
              </li>
            </ul>
          </div>
        </div>
      </transition>
    </div>
    <transition name="list-mask">
      <div class="list-mask" v-show="listShow" @click="hideList"></div>
    </transition>
  </div>
</template>
<style lang="stylus" rel="stylesheet/stylus">
  @import "../../common/stylus/mixin.styl"
  .shopcart
    .shopcart-List
      position fixed
      left 0
      bottom 0
      z-index 50
      width 100%
      height 48px
      background #000
      .content
        display flex
        background #141d27
        font-size 0
        color rgba(255, 255, 255, 0.4)
        .content-left
          flex 1
          .logo-wrapper
            display inline-block
            vertical-align top
            position relative
            top: -10px
            margin 0 12px
            padding 6px
            width 56px
            height 56px
            box-sizing border-box
            border-radius 50%
            background #141d27
            .logo
              width 100%
              height 100%
              border-radius 50%
              text-align center
              background #2b343c
              &.highlight
                background rgb(0, 160, 220)
              .icon-shopping_cart
                line-height 48px
                font-size 24px
                color #80858a
                &.highlight
                  color #fff
            .num
              position absolute
              top 0
              right 0
              width 24px
              height 16px
              line-height 16px
              text-align center
              border-radius 16px
              font-size 9px
              font-weight 700
              color #fff
              background rgb(240, 20, 20)
              box-shadow 0 4px 8px 0 rgba(0, 0, 0, 0.4)
          .price
            display inline-block
            vertical-align top
            margin-top 12px
            line-height 24px
            padding-right 12px
            box-sizing border-box
            border-right 1px solid rgba(255, 255, 255, 0.1)
            font-size 16px
            font-weight 700
            &.highlight
              color #fff
          .desc
            display inline-block
            vertical-align top
            margin 12px 0 0 12px
            line-height 24px
            font-size 12px
        .content-right
          flex 0 0 105px
          width 105px
          .pay
            height 48px
            line-height 48px
            text-align center
            font-size 12px
            font-weight 700
            background #2b333b
            &.not-enough
              background #2b333b
            &.enough
              background #00b43c
              color #fff
      .ball-container
        .ball
          position fixed
          left 32px
          bottom 22px
          z-index 200
          transition all 0.5s cubic-bezier(0.49, -0.29, 0.75, 0.41)
          .inner
            width 16px
            height 16px
            border-radius 50%
            background rgb(0, 160, 220)
            transition: all 0.5s linear
      .shopcart-list
        position absolute
        left 0
        top: 0
        z-index: -1
        width 100%
        transform translate3D(0, -100%, 0)
        &.fold-enter-active, &.fold-leave-active
          transition: all .5s linear;
        &.fold-enter, &.fold-leave-to
          transform translate3D(0, 0, 0)
        .list-header
          height 40px
          line-height 40px
          padding 0 18px
          background #f3f5f7
          border-bottom 1px solid rgba(7, 17, 27, 0.1)
          .title
            float left
            font-size 14px
            color rgb(7, 17, 27)
          .empty
            float right
            font-size 12px
            color rgb(0, 160, 220)
        .list-content
          padding 0 18px
          max-height 217px
          overflow hidden
          background #fff
          .food
            position relative
            padding 12px 0
            box-sizing border-box
            border-1px(rgba(7, 17, 27, 0.1))
          .name
            line-height 24px
            font-size 14px
            color rgb(7, 17, 27)
          .price
            position absolute
            right 90px
            bottom 12px
            line-height 24px
            font-size 14px
            font-weight 700
            color rgb(240, 20, 20)
          .cartcontrol-wapper
            position absolute
            right 0
            bottom 6px
    .list-mask
      position fixed
      top: 0
      left 0
      width 100%
      height 100%
      z-index 40
      backdrop-filter blur(10px)
      background rgba(7, 17, 27, 0.6)
      opacity 1
      &.list-mask-enter-active, &.list-mask-leave-active
        transition: all .5s linear;
      &.list-mask-enter, &.list-mask-leave-to
        background rgba(7, 17, 27, 0)
        opacity 0
</style>
<script type="text/ecmascript-6">
  import BScroll from 'better-scroll';
  import cartcontrol from '../cartcontrol/cartcontrol.vue';
  export default {
    props: {
      selectFoods: {
        type: Array,
        default() {
          return [];
        }
      },
      deliverPrice: {
        type: Number,
        default: 0
      },
      minPrice: {
        type: Number,
        default: 0
      }
    },
    data() {
      return {
        balls: [
          {
            show: false
          },
          {
            show: false
          },
          {
            show: false
          },
          {
            show: false
          },
          {
            show: false
          }],
        dropBalls: [],
        fold: true
      };
    },
    computed: {
      totalPrice() {
        let total = 0;
        this.selectFoods.forEach((food) => {
          total += food.price * food.count;
        });
        return total;
      },
      totalCount() {
        let count = 0;
        this.selectFoods.forEach((food) => {
          count += food.count;
        });
        return count;
      },
      payDesc() {
        if (this.totalPrice === 0) {
          return `￥${this.minPrice}元起送`;
        } else if (this.totalPrice < this.minPrice) {
          let diff = this.minPrice - this.totalPrice;
          return `还差￥${diff}元起送`;
        } else {
          return '去结算';
        }
      },
      payClass() {
        if (this.totalPrice < this.minPrice) {
          return 'not-enough';
        } else {
          return 'enough';
        }
      },
      listShow() {
        if (!this.totalCount) {
          this.fold = true;
          return false;
        }
        let show = !this.fold;
        if (show) {
          this.$nextTick(() => {
            if (!this.scroll) {
              this.scroll = new BScroll(this.$refs.listContent, {click: true});
            } else {
              this.scroll.refresh();
            }
          });
        }
        return show;
      }
    },
    methods: {
      drop(el) {
        for (let i = 0; this.balls.length; i++) {
          let ball = this.balls[i];
          if (!ball.show) {
            ball.show = true;
            ball.el = el;
            this.dropBalls.push(ball);
            return;
          }
        }
      },
      beforeEnter(el) {
        let count = this.balls.length;
        while (count--) {
          let ball = this.balls[count];
          if (ball.show) {
            let rect = ball.el.getBoundingClientRect();
            let x = rect.left - 32;
            let y = -(window.innerHeight - rect.top - 22);
            el.style.display = '';
            el.style.webkitTransform = `translate3d(0,${y}px,0)`;
            el.style.transform = `translate3d(0,${y}px,0)`;
            let inner = el.getElementsByClassName('inner-hook')[0];
            inner.style.webkitTransform = `translate3d(0,${x}px,0)`;
            inner.style.transform = `translate3d(${x}px,0,0)`;
          }
        }
      },
      enter(el) {
        /* eslint-disable no-unused-vars */
        let refresh = el.offsetHeight;
        this.$nextTick(() => {
          el.style.webkitTransform = 'translate3d(0,0,0)';
          el.style.transform = 'translate3d(0,0,0)';
          let inner = el.getElementsByClassName('inner-hook')[0];
          inner.style.webkitTransform = 'translate3d(0,0,0)';
          inner.style.transform = 'translate3d(0,0,0)';
        });
      },
      afterEnter(el) {
        let ball = this.dropBalls.shift();
        if (ball) {
          ball.show = false;
          el.style.display = 'none';
        }
      },
      toggleList() {
        if (!this.totalCount) {
          return;
        }
        this.fold = !this.fold;
      },
      hideList() {
        this.fold = true;
      },
      empty() {
        this.selectFoods.forEach((food) => {
          food.count = 0;
        });
      },
      pay() {
        if (this.totalPrice < this.minPrice) {
          return;
        }
          window.alert(`支付${this.totalPrice}元`);
      }
    },
    components: {
      BScroll,
      cartcontrol
    }
  };
</script>
